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<br /> <br />Requirement <br />Require-ment <br />citation Require- <br />ment <br />complied <br />with 7 <br />es/no <br /> <br />Comment <br /> The Probable Hydrologic Consequences section of the <br /> permit application predicts no appreciable impacts to <br /> ground water systems outside the permit area. <br /> Bedrock ground water. Ground water in overburden and <br /> the coal seam has been monitored for more than 10 years in <br /> three wells that aze located downgradient from the pits: <br /> 79-1, 79-2, and 79-3. Spoil leachate has been monitored for <br /> more than 10 years in spoil well SP-01. Leachate from the <br /> spoil well is an alkaline, sodium bicarbonate water with <br /> TDS consistently azound 1300 mg/I. Chloride content has <br /> always been less than 70 mg/I. Ground water from the <br /> three overburden welts is also an alkaline sodium <br /> bicarbonate type of water, with TDS concentrations in the <br /> range l 100 - 4300 mg/I. The overburden water contains <br /> significantly more chloride than the leachate, generally 200 <br /> - 2500 mg/l, compared to the less than 70 mg/I in the <br /> leachate. This difference in chloride content indicates spoil <br /> leachate has not migrated to the overburden well locations. <br />N. Prevention of The overburden wells are inside the permit area; therefore, <br />adverse impacts CDRMS leachate has probably not migrated beyond the permit area <br />to ground water regulation yes and it is unlikely adverse impacts to bedrock ground <br />systems outside 4.05.11 systems have occurred inside or outside the permit area. <br />the permit area <br /> Alluvial ground water. Alluvium within the area of <br /> influence of the mine is laterally discontinuous and of <br /> limited areal extent (less than 300 acres in aggegate). The <br /> only water from the Marr Mine that could reach the <br /> alluvium would be surface runoff. Spoil leachate is not <br /> likely to reach the alluvium because significant spoil <br /> springs are not expected to forth and the pits were not <br /> excavated in alluvium of significant areal extent. The <br /> quality of surface runoff has been of a quality that is <br /> incapable of degrading alluvial ground water, as indicated <br /> by more than 10 years discharges of surface runoff from <br /> pond F where the discharges have been alkaline, with low <br /> TDS, TSS, and iron content. No mine impacts to alluival <br /> ground water have been found in 10 years of data from <br /> downgradient alluvial monitoring wells at the main part of <br /> the mine (AO-2/AO-2A) or at the loadout(AP-l and AP-2). <br />Page 3 <br />